exam Maths Puzzle Numerical Ability

-54y to the fourth power + 24x Squared

How do i factor this as a difference of two squares?

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exam Other Question

Approximately how long will it take $100 to grow to $500 at 8% annual interest and compounded 12 times per year? Solve by the substitution method.

4x-5y = 21

5x+21= y